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在生产过程中随着生产工况的要求,现有的二台10t/h蒸汽锅炉有时无需连续并联供汽,而其中一台经常要停停开开,但由于二台锅炉由一只除氧器供水,如图1所示,这样就使除氧器液位调节系统设计时,在调节阀的选用上带来一定的困难,基于上述实际情况与工艺要求,设计了单双路供水主副阀跟踪液位调节系统,其系统结构如原理图2所示:系统在初始投运时,可先“手”动操作DFD_1主操作器至液位稳定后,就由“手”动无扰动切换至自动,调整好PI参数,系统即投入正常运行,注意从原理图中可知:此时虽DFC_2的输入量与DFC_1的输
In the production process with the requirements of production conditions, the existing two 10t / h steam boiler sometimes without continuous parallel supply of steam, and one of them often stop to open, but because of two boilers by a deaerator Water supply, as shown in Figure 1, so that the deaerator liquid level adjustment system design, the selection of the control valve to bring some difficulties, based on the above actual conditions and process requirements, the design of single and double water supply main and auxiliary Valve tracking level adjustment system, the system structure as shown in Figure 2: The system put into operation at the initial “hand” operation of the main manipulator DFD_1 until the liquid level is stable, the “hand” switch without disturbance To automatically, adjust the PI parameters, the system is put into normal operation, note that from the schematic diagram: At this point although the input of DFC_2 and DFC_1 lose